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Paper Abstract and Keywords
Presentation 2020-01-22 14:00
[Poster Presentation] Observations of non-audible sound from carbon fiber materials and implementation of frequency shift to the range of audibility signals using multirate techniques
Yuta Hayashi, Yoji Yamada (NIT, Ishikawa College) EA2019-97
Abstract (in Japanese) (See Japanese page) 
(in English) This paper describes observation results of the breaking sound of carbon fiber reinforced plastics (CFRP) materials. A mechanical load was applied to a 10 mm diameter CFRP pipe (plain weave) and the sound was observed using a broadband microphone with a 65 kHz treble cutoff frequency specification under the sampling frequency Fs = 192 kHz. For comparison, observation results of breaking sound of a polycarbonate resin pipe with a diameter of 10 mm and a glass epoxy board are also shown. When a load was applied to a CFRP pipe, an initial breaking sound caused by the load was observed, and then breaking sound was observed at entire pipe was broken. The initial breaking sound of the CFRP pipe contains of 30 to 70 kHz spectrum, and the non-audible frequency components are more prominent than those in the human audible frequency range. The shape of the frequency spectrum of the initial breaking sound is similar to the frequency spectrum of the sound observed when rubbing carbon fiber cloths (plain weave) before resin impregnation. The initial breaking sound of CFRP pipe is thought to suggest that the sound is generated by rubbing carbon fibers. To make these non-audible sounds audible, a frequency conversion method using a downsampler was proposed. The proposed method is implemented using MATLAB/Simulink, and it is confirmed that quasi-real-time processing is realized.
Keyword (in Japanese) (See Japanese page) 
(in English) frequency shift / carbon fiber reinforced plastic / ultrasound / MATLAB / Simulink / frequency shift to audible / quasi-real-time / /  
Reference Info. IEICE Tech. Rep., vol. 119, no. 375, EA2019-97, pp. 77-81, Jan. 2020.
Paper # EA2019-97 
Date of Issue 2020-01-15 (EA) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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reproduction
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee EA US  
Conference Date 2020-01-22 - 2020-01-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Doshisha Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) [Joint Meeting on Acoustics and Ultrasonics Subsociety] Engineering/Electro Acoustics, Ultrasonics, and Related Topics 
Paper Information
Registration To EA 
Conference Code 2020-01-EA-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Observations of non-audible sound from carbon fiber materials and implementation of frequency shift to the range of audibility signals using multirate techniques 
Sub Title (in English)  
Keyword(1) frequency shift  
Keyword(2) carbon fiber reinforced plastic  
Keyword(3) ultrasound  
Keyword(4) MATLAB / Simulink  
Keyword(5) frequency shift to audible  
Keyword(6) quasi-real-time  
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Keyword(8)  
1st Author's Name Yuta Hayashi  
1st Author's Affiliation National Institute of Technology, Ishikawa College (NIT, Ishikawa College)
2nd Author's Name Yoji Yamada  
2nd Author's Affiliation National Institute of Technology, Ishikawa College (NIT, Ishikawa College)
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Date Time 2020-01-22 14:00:00 
Presentation Time 120 minutes 
Registration for EA 
Paper # EA2019-97 
Volume (vol) vol.119 
Number (no) no.375 
Page pp.77-81 
#Pages
Date of Issue 2020-01-15 (EA) 


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